If I click on "Data > Schema Compare" menu option in VS 2010, the VS just closes. No errors, no event log, nothing. This only happens when I try to open the Schema Compare the first time during the lifetime of the VS instance. Same goes for Data Compare option as well. The only way I can make it not crash is by choosing the "Data > Transact SQL-Editor" option first so that it connects to some database, any database. Then I can close the SQL-Editor window and use the schema and data compare functionality.